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Should testify of man - Should give him the character of any man.

He knew what was in man - This he did because he had made all John 1:3, and because he was God, John 1:1. There can be no higher evidence than this that he was omniscient, and was therefore divine. To search the heart is the prerogative of God alone Jeremiah 17:10; and as Jesus knew what was in “these disciples,” and as it is expressly said that he knew what was in man - that is, in “all people” - so it follows that he must be equal with God. As he knows “all,” he is acquainted with the false pretentions and professions of hypocrites. None can deceive him. He also knows the wants and desires of all his real friends. He hears their groans, he sees their sighs, he counts their tears, and in the day of need will come to their relief.

Our Lord knew all men, their nature, dispositions, affections, designs, so as we do not know any man, not even ourselves. He knows his crafty enemies, and all their secret projects; his false friends, and their true characters. He knows who are truly his, knows their uprightness, and knows their weaknesses. We know what is done by men; Christ knows what is in them, he tries the heart. Beware of a dead faith, or a formal profession: carnal, empty professors are not to be trusted, and however men impose on others or themselves, they cannot impose on the heart-searching God.